SKF NN 3008 KTN/SP Cylindrical Roller Bearing 40 × 68 × 21 mm

Super-precision double row cylindrical roller bearing with tapered bore

Cylindrical Roller Bearing

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Category: Cylindrical Roller Bearing
Dimensions: 40x68x21mm

Overview

Super-precision double row cylindrical roller bearing with tapered bore

Super-precision double row cylindrical roller bearings in the NN 30 series provide a unique balance between load carrying capacity, rigidity and speed. Having three flanges on the inner ring and no flanges on the outer ring, the bearings can accommodate axial displacement in both directions. The separable design simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit. The tapered bore enables accurate adjustment of clearance or preload during mounting.

Key features

Very high radial load carrying capacity
High rigidity and high running accuracy
Minimize noise, vibration and heat generation
Accommodate axial displacement in both directions

Typical applications

Industrial electric motors
Gearboxes and reducers
Machine tool spindle support positions
Rolling mills, paper machines, and heavy machinery

Selection guidance

Choose the N, NU, NJ, or NUP design by load direction, axial locating requirement, cage material, internal clearance, and lubrication condition.

Symbol	Value	Description
C	42.9 kN	Basic dynamic load rating
C0	56 kN	Basic static load rating
grease_speed_rpm	13 000 r/min	Attainable grease lubrication speed
oil_air_speed_rpm	15 000 r/min	Attainable oil-air lubrication speed

Symbol	Value	Description
d	40 mm	Bore diameter
D	68 mm	Outside diameter
B	21 mm	Width

Symbol	Value	Description
da	min. 45 mm	da
Da	max. 63 mm	Da
ra	max. 1 mm	ra
dn	59.9 mm	dn

Very high radial load capacity
High rigidity and high running accuracy
Minimized vibration and heat generation
Accommodates axial displacement in both directions

Code	Description
베어링 부품	Complete bearing
열 개수	2
보어 유형	Taper 1:12
케이지	Non-metallic
설계	NN
플랜지 개수, 외부 링	0
플랜지 개수, 내부 링	3
루스 플랜지	None
경방향 내부틈새	C1
공차 클래스	Class SP (SP)
소재, 베어링	Bearing steel
코팅	None
씰링	None
윤활유	None
재윤활 기능	None
제품 순 중량	0.278 kg
eClass 코드	23-05-09-01
UNSPSC 코드	31171505

datasheet pdf download

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